For RallyX or rally, you want a narrow tire with limited sidewall so the vehicle responds when you want it too. Offroad / mud / floatation tires can work but you run the risk of flipping or easier flats as the tire is easier to unseat from the rim.

The VX is VERY capable in this endeavor with Jay taking many podium finished and myself taking 2 Best Overalls 2 yrs straight in the Houston SCCA series and recieving my awards from AJ Foytt. himself at the banquet.